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Seborrheic Dermatitis

Seborrheic Dermatitis is a topic covered in the 5-Minute Pediatric Consult.

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Basics

Description

  • Seborrheic dermatitis (SD) is a common, multifactorial skin disease influenced by both host and environmental factors.
  • Involves sebaceous areas of the body
    • Including the scalp, face, back, chest, and intertriginous areas
    • Characterized by greasy, yellow, scaly erythematous lesions
  • Usually a self-limited condition in infants but can be a chronic, relapsing condition in adolescents and adults

Epidemiology

  • Trimodal distribution: infants, adolescents, and adults >50 years of age
  • Highest prevalence between 2 weeks and 3 months of life
  • Affects approximately 10% of the general population and up to 70% of infants in the first 3 months of life
  • No sex predilection in infants; however, in adolescents and adults, males are affected more commonly than females.
  • Seasonal pattern: Prevalence of disease increases in winter months.
  • Strong association between Malassezia species, a common commensal organism, and SD

Risk Factors

  • There are no known genetic factors that contribute to disease.
  • Hormonal effects: exposure to maternal estrogen in infancy and surge of androgens in puberty
  • Use of neuroleptic medications
  • Immunocompromised status
    • Impaired cellular immunity may contribute to pathogenesis of disease.
    • Prevalence of SD in immunocompromised patients is significantly higher than in general population.

General Prevention

There are no known preventive measures.

Pathophysiology

  • Unknown, but suspected role of sebum, Malassezia, and inflammatory factors
  • Androgens stimulate sebaceous glands, causing production of more sebum.
  • Malassezia
    • A lipophilic yeast that is normally found in sebum-rich areas of the skin
    • Can break down skin sebum lipids, producing potentially inflammatory fatty acids
  • In response to the inflammatory fatty acids, keratinocytes produce proinflammatory cytokines.

Etiology

Not completely known, although it is hypothesized that yeast, androgens, and the local host immune response play a role in SD development.

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Citation

Cabana, Michael D., editor. "Seborrheic Dermatitis." 5-Minute Pediatric Consult, 8th ed., Wolters Kluwer, 2019. Pediatrics Central, peds.unboundmedicine.com/pedscentral/view/5-Minute-Pediatric-Consult/617664/all/Seborrheic_Dermatitis.
Seborrheic Dermatitis. In: Cabana MD, ed. 5-Minute Pediatric Consult. 8th ed. Wolters Kluwer; 2019. https://peds.unboundmedicine.com/pedscentral/view/5-Minute-Pediatric-Consult/617664/all/Seborrheic_Dermatitis. Accessed April 19, 2019.
Seborrheic Dermatitis. (2019). In Cabana, M. D. (Ed.), 5-Minute Pediatric Consult. Available from https://peds.unboundmedicine.com/pedscentral/view/5-Minute-Pediatric-Consult/617664/all/Seborrheic_Dermatitis
Seborrheic Dermatitis [Internet]. In: Cabana MD, editors. 5-Minute Pediatric Consult. Wolters Kluwer; 2019. [cited 2019 April 19]. Available from: https://peds.unboundmedicine.com/pedscentral/view/5-Minute-Pediatric-Consult/617664/all/Seborrheic_Dermatitis.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Seborrheic Dermatitis ID - 617664 ED - Cabana,Michael D, BT - 5-Minute Pediatric Consult UR - https://peds.unboundmedicine.com/pedscentral/view/5-Minute-Pediatric-Consult/617664/all/Seborrheic_Dermatitis PB - Wolters Kluwer ET - 8 DB - Pediatrics Central DP - Unbound Medicine ER -